iterating over 2d slice causes trouble

[petrov...@gmail.com]

Hello everyone ! I am new to Go and have been following tutorials and blog posts to learn it .  I am trying to print a 2d array of slices and have run into the following problem

func PrintGrid(grid [][]int ) {
         for x := range grid {
            fmt.Println()
             for i := range x {
                  if x[i] == 0 {
                      fmt.Printf(".")
                 } else {
                    fmt.Printf("^")
                 }
             }
          }  // end for
 } // end PrintGrid

the compiler prints out the following error message
./gameoflife.go:27: cannot range over x (type int)

can you tell me where I went wrong and the right way to loop over such 2d slices ? Thanks

[Dave Cheney]

http://play.golang.org/p/ZylI0fm3Cr

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[Jesse McNelis]

On Wed, Jul 3, 2013 at 7:13 PM, <petrov...@gmail.com> wrote:

Hello everyone ! I am new to Go and have been following tutorials and blog posts to learn it .  I am trying to print a 2d array of slices and have run into the following problem

func PrintGrid(grid [][]int ) {
         for x := range grid {

the compiler prints out the following error message
./gameoflife.go:27: cannot range over x (type int)

can you tell me where I went wrong and the right way to loop over such 2d slices ? Thanks

In a single value context range gives you the index in the slice not the items in the slice.

In the multi-value context range gives you the index and the item.

You probably want:

for _,x:= range grid {}

This ignores the index value and assigns the item to x.

 

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